Packing



F. N. MASON.

l PAKINQ. APPIJCATION FILED NOV..19| I9I`9.

1,402,943. Patented Jan. 10, 1.922.

FIG. 1.

E s INVENTOR WITN S rnannn- Mason.l or rires/pennen. @ministra-venia,assrenon gro ivrasoivV reaktiesY .nostrani aconronemoiv' or rnnnsvnvanm.

t racnnve.

.leonesa appncanmi mei november 1e, 191e. sei-iai no. 339,110.

To all wlw/m tmay .concern `Be it known that l, 'FRANK N. `Mesolfl7 aresident of Pittsburgh, inthe `countyvof Allegheny and State vofPennsylvania, `have invented a newand useful Improvement in Packings, ofwhich the following is aspeciication.

This invention relates to packing designed for use with any mechanismthat requires va fluid-tight non-leakable joint `around amovable rod. Itis particularly adapted for re ciprocating members such vas piston rods.The object of the invention is to provide a.

iiuidftight bearing, composed of adjustableV bearing segments adapted toContact `with the movable member, and .a non-metal1ic Vpacking membersurrounding the bearing segments and adapted to keep them in fluidtightcontact with the piston, or other movable member. l

Referring to the drawings, Fig. lis a longitudinal section of a stuffingbox illustrating this invention applied `to a piston rod; Fig. 2 is aperspective view of the nonmetallic portion of the-packing; and Fig. 3is a perspective View of the bearing segments. t

In these drawings the invention is illustrated as applied to areciprocating piston rod, but it will be `understood that .it may beapplied to the piston of fluid pumps, or to any reciprocal or rotarymember with which a Viuid-tLg'ht joint is necessary.

The packing as illustrated surrounds a piston rod l, and is carried in acasing 2, adapted to screw into' the end of a c vlinder head. or othermounting, as will be obvious. The pac-king comprises two or more bearingsegments 3 each of which has a lateral tongue 4i, and a correspondingrecess 5 on its other side. this arrangement when the segments areplaced in co-operating position, as shown in Fig. 3 the tongues andVgrooves interit to break the joints between segments, and so to preventthe escape of Huid therethrough, in well known manner.`

cause4 it permits the gaps in the two rings tobe placed on oppositesides. thus breaking theV joints. and preventing leakage ofi-luidthrough the packing member. `The packing member is tapered on the insideand'is of suchthickness. thatitjust litsinto the space between the outerwall of the bearing memk bers 3 and the inner wall of thestuiling boxcasing 2, and is of such length as to permit additional travel asthefbearing segments wear thin. i

glandring 8 is adapted todrive the wedge `shaped packingaround `thebearing segments in obvious manner when the .cap Q is screwed down.Obviously the gland ring may be driven yby other .suitable means, as bystud bolts throughthe cap.

The packing member `rings are made of such dense nonfmetallic materialsuch for instance as asbestos or rubber composition, liber, etc. readilydistorted by pressure, at the same timeit has more resiliency thanmetal,and exerts a slightly resilient pressure on the entire exterior of the4bearing segments. The segments `3 are made of any suitableantiffriction `bearing material, `such -as Babbitt metal, bakelitecomposition, ete. VWhen the packing member is driven under pressure ofthe gland ring into the tapered circular recess around the bearingsegments,

it has a wedge-like function. pressing the' of the packing is forcedtightly against the casing, thus preventing escape 0f fluid between thecasing and packing. As the bearing segments wear they move closertogether, in obvious manner, and an occasional turning down of the capi)with the consequent driving of the slightly resilient wedge-4 shapedpacking member into the space around the bearing members, insures aconstant pressure thereon, and consequently a fluid-tight bearing.

It will be observed that the packing member does not normally extendthroughoutthe lspace between the segments 3 and the stuiiing box wall,but that a space l0 is left beyond the thinner end. This permits thebearing to be tightened even after'it has turning down ofthe stuffingbox cap 9, drives the wedge-shaped packing around the bearing segments,and the oppositely dis- Y taking up looseness of the bearing quickly andcertainly, and all of the parts are readily renewable.

Other advantages of the invention Vwill be apparent to those familiarwith the art.

I claim:

l. A packing device for moving shafts comprising a plurality of segmentsadapted to. form a bearing, a hard non-metallic packing ring conformedto the exterior of the bearing segments,la casing around the packingring, and means to exert pressure on the packing ring to drive it aroundthe bearing segments, said segments-having tapered exteriors.

2. A fluid-tight packing for moving members comprising bearing segmentsadapted to fit around the moving members, said bearing segments havingcooperating laterally interitting members, the outer surfaces of thebearing segments being longitudinally tapered, a casing surrounding thebearing segments, a hard elastic tap-ered packing ring adapted Vto fitinto the casing around the segments, and means to drive the packing ringinto the space around the segments against the taper of the bearingmembers.

' 3. A packing"v device-for moving members comprisingy a casingsurounding the member, a plurality of interfitting exteriorly-taperedmetallic segments adapted to form a bearing for/themember, a hardelastic wedge member conformed to fit around the metallic segments,'andmeans to drive V'the wedge member between the casing and ing theirexterior walls longitudinally4 tapered, a hard elastic non-metallicpacking member tapered to. fit the exterior of the vsaid bearing member,a casing adapted to enclose the bearing and packing members, means todrive the packing member between the bearing member andthe 'casing wall,the Vpacking vmember being shorter than the bearing memberand adapted totravel into the space between the casing and bearing member. Intestimony whereof,

set my hand. c

v Y FRANK N. MASON. Vtnesses: 4 v

G. G. TRILL,

HOWARD L. SNIVELY.

I have Vhereunto

